LETTER TO SHAREHOLDERS No. 101

MARKETS AND CUSTOMERS INTERNATIONAL GYPSUM TROPHY: THE WINNERS REVEALED! On April 10, 2025, the awards ceremony for the 14th edition of the Saint-Gobain International Gypsum Trophy was held in Paris. This competition, created by the Group, honors the most talented and skilled gypsum professionals. A total of 85 projects from 29 countries participated in this international event, which highlights the unique collaboration between the Group and its clients across six categories: Ceilings; Innovation; Residential; Culture, Education & Leisure; Commercial & Institutional; and Façades. Two prizes were awarded in each category, along with the President’s Prize (the jury’s favorite) and the Grand Prix, which recognizes the most outstanding project across all categories. The United Arab Emirates won the Grand Prix with the Shebara Hotel, an innovative eco-resort1 located on Shebara Island in the Red Sea. Despite the technical challenges of building in a fragile marine environment, the project was brilliantly executed using a wide range of Saint-Gobain solutions. The President’s Prize, an honorary “jury favorite”, was awarded to the new sports complex in Pacaembu, Brazil. This project blends sports, leisure, and culture while honoring its historical heritage. The restored 1940s architecture features over 12,000 sq.m. of Glasroc® X panels and 27,000 sq.m. of drywall partitions. INITIATIVES OPERATIONAL EXCELLENCE BOOSTED BY START-UPS To remain competitive, SaintGobain teams up with start-ups specializing in digital solutions tailored to industry. Two of them, Plantformance and Newboot, have received minority investments from NOVA, the Group’s venture capital fund. The first, Plantformance, based in Switzerland, has developed a platform called FactoryBrain, which connects industrial equipment. Its solutions are deployed globally, enabling real-time monitoring, predictive maintenance, and large-scale process optimization. The second, Newboot, is a French start-up that has developed a platform capable of collecting data automatically generated by machines across an entire industrial site, without relying on a specific supplier. This infrastructure feeds structured data in real time to analysis tools and business applications, supporting a wide range of use cases — from energy monitoring to process control. Partners since 2022, these collaborations have enabled Saint-Gobain to integrate advanced technologies such as the Internet of Things (IoT), Artificial Intelligence (AI), and digital twins into its factories. Plantformance’s solution has been deployed in over 100 Group plants worldwide, while Newboot’s solution is used at more than 50 sites. These partnerships illustrate the development of SaintGobain’s innovation model, which combines internal R&D with targeted investments via NOVA. By supporting tech start-ups, the Group accelerates its digital transformation and contributes to more efficient and sustainable production. INNOVATION FIRST “NET-ZERO HOUSE” IN INDONESIA Indonesia faces a colossal challenge: filling a housing shortfall of 3 million homes while meeting its climate commitments. To help meet both requirements, SaintGobain Indonesia has unveiled an unprecedented prototype solution: the country’s first “Net-Zero House”. Developed in partnership with PT Wijaya Karya Bangunan Gedung Tbk (WEGE) and PT Dex Solusi Transit (Dex), it opens up a promising path towards housing that is both accessible and environmentally friendly. The house’s modular design means it can be built in just one month, 60% faster than conventional methods. Because it is modular, this “scalable house” can be expanded to meet the changing needs of its occupants. Its energyefficient approach combines solar panels and optimized design to drastically reduce the need for energy. Natural ventilation and a planted central patio improve air circulation, while Saint-Gobain high-performance solar control glass significantly reduces the heat load. It also incorporates 35% Saint-Gobain futuRE2 solutions, bringing together the most sustainable solutions from six Group brands: Isover, Gyproc, Weber, Ecophon, Mortar Utama3 and Adfors. A dedicated mobile application lets occupants track energy consumption and solar output in real time. With four layouts available, ranging from 33 sq.m. to 129 sq.m., this Net-Zero House is accessible to people of all income levels, while maintaining the same high standards of energy efficiency. This pilot project paves the way for a wider transformation of Indonesia’s construction sector. Net Zero GREENSHIP certification from the Green Building Council Indonesia will open up the possibility of “green” funding. The launch of the first commercial project in Bali will bring the largescale rollout to fruition. 1. A hotel establishment combining upscale tourism with responsible environmental practices. 2. In 2025, the Group launched the futuRE program in Indonesia to improve the visibility of the Group’s most sustainable solutions. 3. PT Cipta Mortar Utama is Indonesia’s leading mortars manufacturer and has been part of Saint-Gobain since 2015.

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